A Decade of I Do's: Celebrity Weddings

"Marc and Simon have known each other for a long time, and Marc's a huge worldwide-selling artist, so when "The X Factor" decided to film in Miami, it was perfect," the source tells us. "Marc really likes the idea of spotting new and young talent and he has strong opinions, so being a guest mentor with Simon and his category is perfect."

Fox, however, has no comment on this latest development.

The news of Anthony's involvement comes just days after it was reported that Justin Bieber would also be serving as a celebrity mentor on the show.